Fix parameter simulation for ClassVars with mutable defaults

[seandstewart]

resolves #132

[codecov]

Codecov Report

Merging #134 into main will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage   96.93%   96.93%           
=======================================
  Files          36       36           
  Lines        3854     3856    +2     
=======================================
+ Hits         3736     3738    +2     
  Misses        118      118           

Flag	Coverage Δ
#3.8	96.93% <100.00%> (+<0.01%)	⬆️
#unittests	96.93% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
typic/serde/resolver.py	95.33% <100.00%> (+0.03%)	⬆️
typic/ext/schema/schema.py	97.35% <0.00%> (ø)

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